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## [DXGI]Disabling Alt+Enter?

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### #1hupsilardee  Members

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Posted 11 November 2012 - 08:45 AM

I do love the easy fullscreen switching in D3D10+. However I would not like this to be controlled via Alt+Enter, I prefer F4 to toggle fullscreen. (A throwback to my GameMaker days ). The below code controls fullscreen-switching, but why does Alt+Enter still work? The pSwapChain was definitely created without DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH.

bool Device::IsFullscreen()
{
BOOL fs;
pSwapChain->GetFullscreenState(&fs, NULL);
return (bool)fs;
}
void Device::SetFullscreen(bool fs)
{
BOOL dummy = (BOOL)fs;
pSwapChain->SetFullscreenState(&dummy, NULL);
}

// Yeah I am aware that multi-monitor systems might break this... I promise to fix that later!

void UpdateGame()
{
// message pump

if (input->KeyPressed(VK_F4))
{
// F4 toggles fullscreen
pDevice->SetFullscreen(!pDevice->IsFullscreen());
}
}



Also, how do people get those nice blue tags on their topics?

Edited by hupsilardee, 11 November 2012 - 09:06 AM.

### #2Erik Rufelt  Members

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Posted 11 November 2012 - 09:07 AM

You can use the IDXGIFactory::MakeWindowAssocation function to disable Alt+Enter: http://msdn.microsof...0(v=vs.85).aspx

Mode switch refers to changing the monitor resolution to match the back-buffer. Even without mode switch the swap-chain can go to fullscreen mode with the desktop resolution.

Edited by Erik Rufelt, 11 November 2012 - 09:10 AM.

### #3hupsilardee  Members

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Posted 11 November 2012 - 09:29 AM

Thanks for the quick reply. I found that page as well but was unable to get it to work. Here's the device/swap chain creation (minus error checking etc)


// Initialise SwapChainDesc...
SwapChainDesc.Flags = 0;

IDXGIFactory* factory;
CreateDXGIFactory(IID_IDXGIFactory, (void**)&factory);
HRESULT hr = D3D10CreateDevice(NULL, D3D10_DRIVER_TYPE_HARDWARE, NULL, 0/*flags*/, D3D10_SDK_VERSION, &pDevice);
hr = factory->CreateSwapChain(pDevice, &SwapChainDesc, &pSwapChain);
hr = factory->MakeWindowAssociation(window->GetHWND(), DXGI_MWA_NO_ALT_ENTER);

factory->Release();



I checked the HR line-by-line using breakpoints. All returns S_OK. But Alt+Enter Still Works! I can't leave this alone because Alt and Enter are both likely to be used as character controls, and it's very conceivable that the player might press both.

### #4mhagain  Members

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Posted 11 November 2012 - 10:46 AM

This is fun.

There is a serious omission in the D3D documentation surrounding the MakeWindowAssociation call; what it fails to mention (IIRC it hints at it but never states it outright) is that the IDXGIFactory used for MakeWindowAssociation must be retrieved via calling IDXGISwapchain::GetParent first. Then it works; otherwise it won't.

It appears that the gentleman thought C++ was extremely difficult and he was overjoyed that the machine was absorbing it; he understood that good C++ is difficult but the best C++ is well-nigh unintelligible.

### #5hupsilardee  Members

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Posted 11 November 2012 - 11:13 AM

This is also fun. Found this discussion on stackoverflow

http://stackoverflow.com/questions/2353178/disable-alt-enter-in-a-direct3d-directx-application

So I changed my startup code. (Again, without error checking)

DWORD flags = 0;
#ifdef _DEBUG
flags |= D3D10_CREATE_DEVICE_DEBUG;
#endif
//{
//}
HRESULT hr = D3D10CreateDevice(NULL, D3D10_DRIVER_TYPE_HARDWARE, NULL, flags, D3D10_SDK_VERSION, &pDevice);
IDXGIDevice* dxgiDevice;
IDXGIFactory* factory;
pDevice->QueryInterface(IID_IDXGIDevice, (void**)&dxgiDevice);
hr = factory->CreateSwapChain(pDevice, &SwapChainDesc, &pSwapChain);
hr = factory->MakeWindowAssociation(window->GetHWND(), DXGI_MWA_NO_ALT_ENTER);
factory->Release();
dxgiDevice->Release();


Guess what? Didn't work.

However, using DXGI_MWA_NO_WINDOW_CHANGES does work, but it makes a Windows beep. Now I would like to get rid of this. What a pain.

### #6mhagain  Members

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Posted 11 November 2012 - 11:16 AM

You need pSwapChain->GetParent for MWA.

I have this working in my own code and I'll dig it out later on this evening for you if you need it.

It appears that the gentleman thought C++ was extremely difficult and he was overjoyed that the machine was absorbing it; he understood that good C++ is difficult but the best C++ is well-nigh unintelligible.

### #7hupsilardee  Members

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Posted 11 November 2012 - 11:29 AM

I would really appreciate it if it's not too much trouble, mhagain. However I can now call the problem half-solved. If I use MWA_NO_WINDOW_CHANGES along with the above code, Alt+Enter doesn't toggle fullscreen. It does make a beeping, only in windowed mode, but most people play games in fullscreen anyway.

Although now I'm worrying about the other effects of MWA_NO_WINDOW_CHANGES

### #8mhagain  Members

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Posted 11 November 2012 - 01:26 PM

OK, first things first, I'm using D3D11. That shouldn't matter much as the basic process is the same; just so you're aware of it.

Secondly, I create using D3D11CreateDeviceAndSwapchain - that may be relevant and I'd recommend that for D3D10 you also use D3D10CreateDeviceAndSwapchain, if for no other reason, to rule out uncertainty/difference in the basic creation.

On to the code:

IDXGIFactory1 *pFactory = NULL;

if (SUCCEEDED (d3d11_SwapChain->GetParent (__uuidof (IDXGIFactory1), (void **) &pFactory)))
{
pFactory->MakeWindowAssociation (vid.Window, DXGI_MWA_NO_ALT_ENTER);
pFactory->Release ();
}

That's literally it. No need for DXGI_MWA_NO_WINDOW_CHANGES and no beep happens.

It appears that the gentleman thought C++ was extremely difficult and he was overjoyed that the machine was absorbing it; he understood that good C++ is difficult but the best C++ is well-nigh unintelligible.

### #9hupsilardee  Members

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Posted 15 November 2012 - 10:52 AM

Thanks for the help mhagain. However it STILL doesn't work for me Perhaps it's because you are using DXGI 1.1? Should I start using DXGI 1.1 or will that cause problems for people on Vista who don't install their service packs?

### #10hupsilardee  Members

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Posted 03 December 2012 - 10:31 PM

Hello again. Sorry to resurrect such an old thread, but I thought I would post with 2 things:

Firstly, the problem has been solved

Secondly, I've been playing Black Ops 2 recently, and I noticed to my amusement that Alt+Enter is not disabled; handy for playing in windowed mode so people who knock on my door remain convinced that I'm being productive . However, they have the same problem I had with the beeping in windowed mode

### #11mhagain  Members

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Posted 04 December 2012 - 04:42 AM

It appears that the gentleman thought C++ was extremely difficult and he was overjoyed that the machine was absorbing it; he understood that good C++ is difficult but the best C++ is well-nigh unintelligible.

### #12Endurion  Members

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Posted 04 December 2012 - 09:27 AM

As a game player I'd prefer to have Alt-Enter in, this is IMHO quasi standard; whereas F4 feels like the odd one out.